Question 8604: What are the divisibilty rules to the numbers 13,14,15,16,17,18,19 and 20?
Found 2 solutions by mathsolver, rapaljer:
Answer by mathsolver(3)   (Show Source):
You can put this solution on YOUR website! We all know the rules till 10 or 11
but not 0f 12 13 and so on so we take 2 numbers till 10 whose sum is the number of which you are checking the divisibility.
Eg.of 14
9 + 5=14
you will check their divisibility if a number is divisible by both 9 and 5 it will be divisible by 14 too.
the same gose for 13, 15,16 17 and so on
Hope it is clear now.
Answer by rapaljer(4671)  (Show Source):
You can put this solution on YOUR website! I MUST ENTIRELY AND COMPLETELY DISAGREE ON THE SOLUTION TO THIS PROBLEM!! The solution previously posted is absolutely WRONG!! A divisibility rule for 14 consists of determining if a number is divisible by the ALL FACTORS of 14, which would be 2 and 7!! It has NOTHING TO DO WITH DIVISIBILITY by 9 and 5!
Likewise, divisibility by 15 requires that a number be divisible by 3 and 5.
Divisibility by 18 requires divisibility by 2 and 9, and divisibility by 20 requires divisibility by 4 and 5. I don't know the divisibility rules for 13, 17, or 19. Maybe someone else can add solution for those.
R^2 at SCC
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